wAcceleration Property (UpDown Controls)

Applies to TestComplete 15.64, last modified on May 16, 2024


When a user clicks the up or down button of an up-down control and holds it for a period of time, the control’s value changes at a higher speed. In other words, the control can use acceleration to change the rate of increasing or decreasing its value. Acceleration information includes time interval settings and the number of units to increase or decrease the control’s value. An up-down control can use several degrees of acceleration or none at all. The wAcceleration property provides access to an acceleration item by its index. The total number of acceleration items is specified by the wAccelerationCount property.



Read-Only Property Win32AccelerationInfo object
TestObj A variable, parameter or expression that specifies a reference to one of the objects listed in the Applies To section
Index [in]    Required    Integer    

Applies To

The property is applied to the following object:

View Mode

To view this property in the Object Browser panel and in other panels and dialogs, activate the Advanced view mode.


The property has the following parameter:


Specifies the index of the desired acceleration item. The first item has index 0, the second - 1, and so on.

Property Value

A Win32AccelerationInfo object that contains the acceleration parameters.


If the specified acceleration item is not found, the wAcceleration property returns an empty value (Nothing in VBScript, null in JavaScript, JScript, C++Script and C#Script, None in Python and nil in DelphiScript) and posts an error message to the test log.


To view an example that demonstrates how to use the wAcceleration property, see UpDown Acceleration Information in Desktop Windows Applications.

See Also

UpDown Acceleration Information in Desktop Windows Applications
Win32AccelerationInfo object
wAccelerationCount Property (UpDown Controls)

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